William Peter Blatty, American author and screenwriter (d. 2017)
William Peter Blatty (January 7, 1928 – January 12, 2017) was an American writer, director and producer. He is best known for his 1971 novel The Exorcist, for which he won the Academy Award for the screenplay of its film adaptation and was nominated for Best Picture as its producer. The film also earned Blatty the Golden Globe Award for Best Motion Picture – Drama as producer. He also wrote and directed the sequel The Exorcist III.After the success of The Exorcist, Blatty reworked Twinkle, Twinkle, "Killer" Kane! (1966) into a new novel titled The Ninth Configuration, published in 1978. Two years later, Blatty adapted the novel into a film of the same title that he also directed and won Best Screenplay and was nominated for Best Picture at the 38th Golden Globe Awards. Some of his other notable works are the novels Elsewhere (2009), Dimiter (2010) and Crazy (2010).

Born and raised in New York City, Blatty received his bachelor's degree in English from Georgetown University in 1950, and his master's degree in English literature from the George Washington University. Following completion of his master's degree in 1954, he joined the United States Air Force and served in the Psychological Warfare Division where he attained the rank of first lieutenant. After service in the air force, he worked for the United States Information Agency in Beirut.